I've come across a few threads that mention the term "future data." Specifically referencing the idea that backtesting results may be greatly over exaggerated due to the fact that the system uses future data. Okay, I get the idea that future data is just data in the future that shouldn't be available to the trading system. But what I dont get is how a system could even reference the future? I use Easylanguage if it makes any difference. I'm just trying to figure out how one would reference the future so i dont make the same mistake. Thanks in advance.